Thayer's Gull (thayeri)

(last update: January 22, 2013)

Coordinators:
Amar Ayyash (USA)
Mars Muusse (Netherlands)

Thayer's Gull 1st cycle (1CY), December 10 2013, Half Moon Bay, California. Picture: Alvaro Jaramillo.

Bird in juvenile plumage, maybe just single very small mantle feathers replaced.